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 ###Instrução: Quais são as datas das consultas feitas pelo gerente de saída Colin Hendry?
 ###Tabelas: CREATE TABLE class (class_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Pennant VARCHAR, Builder VARCHAR, Laid Down VARCHAR, Launched VARCHAR, Commissioned VARCHAR) CREATE TABLE 2008i (2008i_id AUTO_INCREMENT PRIMARY KEY, Director(s) VARCHAR, Writer(s) VARCHAR, Recipient VARCHAR, Date VARCHAR, Award VARCHAR) CREATE TABLE rank_by_number_of_wins (rank_by_number_of_wins_id AUTO_INCREMENT PRIMARY KEY, City & Nation VARCHAR, First Place INT, Second Place INT, Third Place INT, Total Top 3 Placements INT, First Place Winning Year(s) (if applicable) VARCHAR) CREATE TABLE managerial_changes (managerial_changes_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Outgoing manager VARCHAR, Manner of departure VARCHAR, Date of vacancy VARCHAR, Replaced by VARCHAR, Date of appointment VARCHAR) CREATE TABLE mayors (mayors_id AUTO_INCREMENT PRIMARY KEY, Election VARCHAR, Date of election VARCHAR, Candidates VARCHAR, Results VARCHAR, Total votes INT)  
SELECT Date of appointment FROM managerial_changes WHERE Outgoing manager = Colin Hendry